单项选择题


Questions 19 to 22 are based on the conversation you have just heard.

A．A house.
B．A car.
C．A hotel.
D．An art gallery.
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填空题
Leptin is effective in reducing weight but it’s many years away before humans can use it.
单项选择题
A．History teacher.B．College professor.C．History writer.D．Campaign manager.
A．History teacher.
B．College professor.
C．History writer.
D．Campaign manager.
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